CN110779263A - Double-working-medium indirect air cooling system and control method thereof - Google Patents
Double-working-medium indirect air cooling system and control method thereof Download PDFInfo
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- CN110779263A CN110779263A CN201911203673.6A CN201911203673A CN110779263A CN 110779263 A CN110779263 A CN 110779263A CN 201911203673 A CN201911203673 A CN 201911203673A CN 110779263 A CN110779263 A CN 110779263A
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- 238000001816 cooling Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 252
- 239000007788 liquid Substances 0.000 claims abstract description 88
- 230000002528 anti-freeze Effects 0.000 claims abstract description 70
- 238000007710 freezing Methods 0.000 claims abstract description 22
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 238000002637 fluid replacement therapy Methods 0.000 claims 3
- 230000009977 dual effect Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008014 freezing Effects 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 17
- 239000000498 cooling water Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000005399 mechanical ventilation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses a double-working-medium indirect air cooling system and a control method thereof, belonging to the field of indirect air cooling systems of main engines or auxiliary engines of thermal power plants. A double-working-medium indirect air cooling system is characterized in that a pump is arranged on a water outlet pipeline of a demineralized water storage tank, a pump is arranged on a water outlet pipeline of an antifreeze liquid storage tank, the water outlet pipeline of the demineralized water storage tank is connected to the downstream of a water inlet pipeline of working equipment, the water outlet pipeline of the antifreeze liquid storage tank is connected to the upstream, and a switching valve is arranged between the downstream and the upstream; a water outlet pipeline of the working equipment is connected with a water inlet pipeline of the radiator, a first water outlet pipeline of the radiator is connected with a water inlet pipeline of the working equipment, a second water outlet pipeline is respectively connected with a water return pipeline of desalted water and antifreeze, a water return valve is arranged on the desalted water return pipeline, and a water return valve is arranged on the antifreeze water return pipeline; and valves are arranged on the pipelines. The double-working-medium indirect air cooling system and the control method thereof meet the cooling effects of freezing prevention in severe cold and cooling in hot.
Description
Technical Field
The invention belongs to the field of indirect air cooling systems of main engines or auxiliary engines of thermal power plants, and particularly relates to a double-working-medium indirect air cooling system and a control method thereof.
Background
The indirect air cooling system is an existing mainstream cooling mode, greatly reduces the water consumption and effectively saves water resources. But freeze protection is a major problem in current practice. When the indirect air cooling system operates at a lower temperature, the heat exchange area of the radiator is large, the heat storage capacity of the water-air heat exchanger (cooling triangle) is relatively small, the temperature of circulating water in the fin tubes of the radiator is reduced under the influence of the air temperature, the cooling water is reduced to 0 ℃ or below, the heat transfer performance of a light person is reduced, and the tube bundle of a heavy person is blocked or is frozen and deformed.
In order to prevent the frost cracking of the air-cooled radiator with high price, the cooling effect in winter needs to be sacrificed no matter the air inlet amount is adjusted by the shutter or the partial sector is shut down, the back pressure cannot be reduced to block the back pressure for operation, and the economic benefit cannot reach the optimal working condition. The conventional indirect air cooling system has poor adaptability to severe cold conditions. The anti-freezing problem is more severe for application scenes with intermittent operation conditions such as photo-thermal power stations and the like.
Disclosure of Invention
The invention aims to overcome the defect that a radiator in the existing indirect air cooling system of an auxiliary machine and a main machine of a photo-thermal power station is easy to frost crack, and provides a double-working-medium indirect air cooling system and a control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a double-working-medium indirect air cooling system comprises a demineralized water storage tank, an antifreeze liquid water delivery pump, a switching valve, an antifreeze liquid water return valve, working equipment and a plurality of radiators;
a water outlet pipeline of the desalted water storage tank is provided with a desalted water delivery pump, a water outlet pipeline of the antifreeze water storage tank is provided with an antifreeze water delivery pump, the water outlet pipeline of the desalted water storage tank is connected to the upstream of a water inlet pipeline of the working equipment, the water outlet pipeline of the antifreeze water storage tank is connected to the downstream of the water inlet pipeline of the working equipment, and a switching valve is arranged between the upstream and the downstream of the water inlet pipeline;
a water outlet pipeline of the working equipment is connected with a water inlet pipeline of the radiator, a first water outlet pipeline of the radiator is connected with a water inlet pipeline of the working equipment, a second water outlet pipeline of the radiator is respectively connected with a water return pipeline of the demineralized water storage tank and a water return pipeline of the antifreeze storage tank, a demineralized water return valve is arranged on the water return pipeline of the demineralized water storage tank, and an antifreeze return valve is arranged on the water return pipeline of the antifreeze storage tank;
and valves are arranged on the pipelines.
Furthermore, the water outlet pipeline of the demineralized water storage tank is connected to the downstream of the water inlet pipeline of the working equipment, and the water outlet pipeline of the antifreeze water storage tank is connected to the upstream of the water inlet pipeline of the working equipment.
Further, the device also comprises a high-level expansion water tank for maintaining water pressure;
the high-level expansion water tank is arranged on a water inlet pipeline of the working equipment.
Furthermore, the system also comprises a circulating water pump arranged on a water inlet pipeline or a water outlet pipeline of the working equipment, and the circulating water pump is used for making up the head loss of the system.
Further, the system also comprises a liquid supplementing system communicated with the antifreezing solution storage tank.
Furthermore, the liquid supplementing system comprises an antifreezing solution water supplementing tank and a pump, and the pump is arranged at an outlet of the antifreezing solution water supplementing tank.
Further, the working equipment is main plant auxiliary equipment.
Furthermore, the working equipment is a main plant host condenser.
The control method of the double-working-medium indirect air cooling system comprises the operations of liquid filling, liquid returning and system operation, and the switching of two working mediums is completed through the liquid returning and the liquid filling, wherein the three operations are specifically as follows:
when liquid is filled, liquid in the demineralized water storage tank or the antifreeze liquid storage tank enters each pipeline and each working device through the corresponding pump and the corresponding switching valve to finish liquid filling;
when the system operates, liquid exchanges heat in the working equipment, the liquid heated by the working equipment enters each radiator, the liquid is cooled in the radiators, the cooled liquid enters the working equipment again through outlets of the radiators, and the liquid in the system exchanges heat circularly between the working equipment and the radiators;
when the liquid returns, the liquid in the system enters the demineralized water storage tank or the antifreeze liquid storage tank through the water return pipeline.
Further, the liquid filling operation and the liquid returning operation are specifically as follows:
the liquid filling operation specifically comprises the following steps:
if the anti-freezing device is required to be anti-frozen, the switching valve is closed, the anti-freezing liquid conveying pump is started, and the anti-freezing liquid enters a water inlet pipeline of the working equipment and the working equipment to finish liquid filling;
otherwise, opening the switching valve, starting the demineralized water delivery pump, and enabling the demineralized water to enter a water inlet pipeline of the working equipment and the working equipment to finish liquid filling;
the liquid return operation specifically comprises the following steps:
when the system is filled with the antifreeze, the return valve of the desalted water is closed, the return valve of the antifreeze is opened, and the liquid in the system enters the return pipeline of the antifreeze water storage tank through the second water outlet pipeline of the radiator and further enters the antifreeze water storage tank;
when the system is filled with desalted water, the antifreeze liquid return valve is closed, the desalted water return valve is opened, and the liquid in the system enters the return pipeline of the desalted water storage tank through the second water outlet pipeline of the radiator and further enters the desalted water storage tank.
Compared with the prior art, the invention has the following beneficial effects:
according to the double-working-medium indirect air cooling system, an anti-freezing solution and desalted water working medium operation system is added in the photo-thermal power station auxiliary engine and main engine indirect air cooling system, and an anti-freezing solution working medium is adopted as a cooling medium in severe cold, so that the anti-freezing problem of an auxiliary engine system is fundamentally solved; on the other hand, as the specific heat capacity of the antifreeze is lower than that of the demineralized water, the cooling requirement can not be met in hot days, and the operation is switched to the demineralized water operation, so that the area of a radiator is not required to be increased, and the investment is prevented from being increased.
Furthermore, the existence of the high-level expansion water tank is used for ensuring the stable water pressure of the double-working-medium indirect air cooling system.
Furthermore, the existence of the circulating water pump is used for overcoming the hydraulic loss of the duplex indirect air cooling system.
Furthermore, the liquid supplementing system is used for supplementing liquid to the anti-freezing liquid storage tank, so that manual work is omitted.
Furthermore, the auxiliary machine is frequently started and stopped, and has a severe anti-freezing requirement when being cold, so that the anti-freezing problem is fundamentally solved when the auxiliary machine is used as an auxiliary machine cooling system, the cooling effect when being hot is ensured to the maximum extent, and the service life of the equipment is prolonged.
Furthermore, when the device is used as a cooling system of the host machine, the anti-freezing problem in severe cold is solved, the back pressure of the host machine can be controlled to be blocked to operate, and the operating cost is effectively reduced; and in non-cold seasons, the specific heat capacity is switched to a demineralized water working medium for operation, so that the cooling effect is ensured while the area of the heat exchanger is not increased, and the system investment is reduced.
The control method of the dual-working-medium indirect air cooling system comprises the operations of liquid filling, operation and liquid discharging, wherein the liquid filling and the liquid discharging can complete the switching of different working media in the system, during the operation, heat exchange is continuously carried out between the working equipment and the radiator, the heat in the system is recycled, the influence of the external temperature on the system is reduced by utilizing the heat of the system, the cooling effects of freezing prevention and hot water during severe cold are met based on the different specific heat capacities of the two working media of the anti-freezing liquid and the demineralized water, the operation is convenient and fast, and the electric control can be realized.
Drawings
FIG. 1 is a diagram of a dual-working-medium indirect air cooling system applied to auxiliary machine cooling;
FIG. 2 is a diagram of a dual-medium indirect air cooling system for mechanical ventilation cooling of a main machine;
fig. 3 is a diagram of a dual-medium indirect air cooling system applied to the natural draft cooling of a main machine.
Wherein: 1-1-a demineralized water storage tank; 1-2-antifreeze water storage tank; 2-1-a demineralized water delivery pump; 2-2-antifreeze liquid delivery pump; 3-1-a valve for removing brine; 3-2-antifreezing solution water replenishing pump; 4-1-demineralized water return valve; 4-2-antifreeze return valve; 5-1-demineralized water drain valve; 5-2-antifreeze drain valve; 6-fluid infusion system; 7-1-main plant host condenser; 7-2-main plant auxiliary equipment; 8-1-a main engine circulating water pump; 8-2-auxiliary engine cooling water pump; 9-1-a main machine circulating water pipe; 9-2-auxiliary machine cooling water pipe; 10-high expansion water tank; 11-heat sink.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a double-working-medium indirect air cooling system, which increases the working condition of working medium of anti-freezing solution in an auxiliary machine and a main machine indirect air cooling system of a photo-thermal power station, and adopts the working medium of the anti-freezing solution as a cooling medium in winter, thereby fundamentally solving the anti-freezing problem of the auxiliary machine system. Because the specific heat capacity of the antifreeze is lower than that of the demineralized water, the heat dissipation area needs to be increased to meet the cooling effect in summer, and the investment is increased. In order to avoid the defects, the invention is additionally provided with a set of desalted water working medium storage and switching units, and the operation of the indirect air cooling system by adopting any working medium of antifreeze solution/desalted water is realized in a switching mode.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a diagram of a dual-working medium indirect air cooling system applied to auxiliary machine cooling, wherein the dual-working medium indirect air cooling system comprises a desalted water storage tank 1-1, an antifreeze solution storage tank 1-2, a desalted water delivery pump 2-1, an antifreeze solution delivery pump 2-2, a desalted water supply valve 3-1, an antifreeze solution water supply pump 3-2, desalted water charging, a desalted water return valve 4-1, an antifreeze solution charging, an antifreeze solution return valve 4-2, a desalted water drain valve 5-1, an antifreeze solution drain valve 5-2, a liquid supply system 6, main plant auxiliary equipment 7-2, an auxiliary machine cooling water pump 8-2, an auxiliary machine cooling water pipe 9-2, a high-level expansion water tank 10 and a radiator 11;
a water outlet pipeline of the desalted water storage tank 1-1 is provided with a desalted water pump 2-1, a water outlet pipeline of the antifreeze water storage tank 1-2 is provided with an antifreeze water pump 2-2, a water outlet pipeline of the desalted water storage tank 1-1 is connected to the upstream of a water inlet pipeline of the main plant auxiliary equipment 7-2, a water outlet pipeline of the antifreeze water storage tank 1-2 is connected to the downstream of a water inlet pipeline of the main plant auxiliary equipment 7-2, and a switching valve is arranged between the downstream and the upstream of the water inlet pipeline; a water inlet pipeline of the radiator is connected with a water outlet pipeline of the main plant auxiliary equipment 7-2, a first water outlet pipeline of the radiator is connected with a water inlet pipeline of the main plant auxiliary equipment 7-2, a second water outlet pipeline of the radiator is respectively connected with a water return pipeline of the desalted water storage tank 1-1 and a water return pipeline of the antifreeze water storage tank 1-2, a desalted water return valve 4-1 is arranged on the water return pipeline of the desalted water storage tank 1-1, and an antifreeze water return valve 4-2 is arranged on the water return pipeline of the antifreeze water storage tank 1-2; a water drain pipeline is connected between the demineralized water storage tank 1-1 and a water inlet pipeline of the main plant auxiliary equipment 7-2, a demineralized water drain valve 5-1 is arranged on the water drain pipeline, a water drain pipeline is connected between the antifreeze water storage tank 1-2 and a water outlet pipeline of the main plant auxiliary equipment 7-2, and an antifreeze water drain valve 5-2 is arranged on the water drain pipeline; an auxiliary machine cooling water pump 8-2 and a high-level expansion water tank 10 are also arranged on a water inlet pipeline of the auxiliary machine equipment 7-2 of the main workshop; the antifreeze liquid water storage tank 1-2 is also connected with an antifreeze liquid water supplementing tank, and a pump is arranged between the antifreeze liquid water storage tank and the antifreeze liquid water supplementing tank; and valves are arranged on the pipelines. The valve can be an electric butterfly valve.
Referring to fig. 2 and 3, fig. 2 and 3 are diagrams of a dual-working medium indirect air cooling system applied to mechanical ventilation cooling of a main machine and natural ventilation cooling of the main machine, respectively, and the components and the connection relationship between the components in fig. 2 and 3 are the same as those in fig. 1, namely, working equipment is replaced by a main plant auxiliary equipment to form a main plant main machine condenser, and the main plant main machine condenser in a main machine mechanical ventilation cooling mode is shown in fig. 2, and the main plant main machine condenser in a main machine natural ventilation cooling mode is shown in fig. 3, so that the dual-working medium indirect air cooling system can meet the requirement of being switched into different working media at different temperatures.
When the antifreezing mixed liquid is used as a cooling medium in winter, the proportion of the antifreezing mixed liquid and the formula of the additive need to be adjusted according to the environmental temperature of the engineering project, so that the antifreezing performance and the anticorrosive performance of the antifreezing mixed liquid can obtain the best effect. Besides the salt water, the working medium in the indirect air cooling system is additionally added with an antifreezing mixed liquid working medium. The working medium of the antifreezing mixed liquid is prepared by mixing ethylene glycol type, propylene glycol type or other types of cooling liquid and demineralized water according to a certain proportion.
When the two working mediums are switched in different seasons, the temporarily unused working medium needs to be stored in a closed manner according to the storage time and the characteristics of the working medium, so that the working medium is ensured to have a longer service life.
The dual-working-medium indirect air cooling system operates as follows:
when the system runs in winter, the demineralized water in the whole indirect air cooling system is discharged through a demineralized water drain valve 5-1 and a demineralized water return valve 4-1, and the demineralized water in the system flows back to a demineralized water storage tank 1-1;
closing a desalted water return valve 4-1 and a desalted water drain valve 5-1, opening an antifreeze liquid delivery pump 2-2, supplementing antifreeze liquid to the whole indirect air cooling system pipeline, simultaneously opening a circulating water pump and a heat dissipation device, starting to open a first sector for water filling when the temperature of circulating water rises, and sequentially opening a next sector when the temperature of water in the system rises to a higher temperature again to enter a normal operation working condition;
the antifreeze after heat exchange by the main condenser 7-1 or the main plant auxiliary equipment 7-2 is sent to the radiator 11 through the circulating water pipe 9-1 or the auxiliary equipment cooling water pipe 9-2, after air cooling, the cooled antifreeze is sent back to the main plant through the circulating water pipe 9-1 or the auxiliary equipment cooling water pipe 9-2 to provide a cooling medium for the main condenser 7-1 or the main plant auxiliary equipment 7-2, the water head loss in the system is maintained by the circulating water pump 8-1 or the auxiliary equipment cooling water pump 8-2, and the high-level expansion water tank 11 is used for ensuring the water pressure in the system to be stable; and when the water level of the antifreeze liquid storage tank 1-2 is reduced, the antifreeze liquid is supplemented.
After the operation in winter is finished, the antifreeze in the whole indirect air cooling system is emptied through an antifreeze water drain valve 5-2 and an antifreeze water return valve 5-2 and stored in an antifreeze water storage tank 1-2, and then the antifreeze water return valve 5-2 and the antifreeze water drain valve 5-2 are closed; opening a demineralized water delivery pump 2-1, filling water into pipelines and sectors of the whole indirect air cooling system, and simultaneously starting a circulating water pump and heat dissipation equipment to enter a normal operation working condition; the desalted water after heat exchange of the main machine condenser 7-1 or the main plant auxiliary equipment 7-2 is sent to the radiator 11 through the circulating water pipe 9-1 or the auxiliary equipment cooling water pipe 9-2, after air cooling, the cooled desalted water is sent back to the main plant through the circulating water pipe 9-1 or the auxiliary equipment cooling water pipe 9-2 to provide cooling water media for the main machine condenser 7-1 or the main plant auxiliary equipment 7-2, the loss of a water head in the system is maintained by the circulating water pump 8-1 or the auxiliary equipment cooling water pump 8-2, and the high-level expansion water tank 11 is used for ensuring the water pressure in the system to be stable; when the water level of the demineralized water storage tank 1-1 is reduced, the demineralized water is supplemented.
The invention discloses a double-working medium indirect air cooling system, which fundamentally solves the anti-freezing problem of the indirect air cooling system for the characteristics of low extreme temperature region and discontinuous operation of an auxiliary machine of a photo-thermal unit, not only improves the safety of equipment operation, but also enables a main machine to operate under the working condition of blocking back pressure in winter, further reduces the energy consumption and improves the energy utilization efficiency. The invention of the double-working medium indirect air cooling system provides a reliable technical scheme for the transformation of a plurality of cooling systems of thermal power plants at home and abroad, and provides more choices for the cooling systems in the power industry and other industries. The scheme solves the problems of winter freezing prevention and insufficient summer treatment of the conventional air cooling system at a very low cost, and is worthy of popularization and application.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A double-working-medium indirect air cooling system is characterized by comprising a desalted water storage tank (1-1), an antifreeze liquid storage tank (1-2), a desalted water delivery pump (2-1), an antifreeze liquid delivery pump (2-2), a switching valve, a desalted water return valve (4-1), an antifreeze liquid return valve (4-2), working equipment and a plurality of radiators;
a desalted water delivery pump (2-1) is arranged on a water outlet pipeline of the desalted water storage tank (1-1), an antifreezing solution delivery pump (2-2) is arranged on a water outlet pipeline of the antifreezing solution storage tank (1-2), the water outlet pipeline of the desalted water storage tank (1-1) is connected to the upstream of a water inlet pipeline of the working equipment, the water outlet pipeline of the antifreezing solution storage tank (1-2) is connected to the downstream of the water inlet pipeline of the working equipment, and a switching valve is arranged between the upstream and the downstream of the water inlet pipeline;
a water outlet pipeline of the working equipment is connected with a water inlet pipeline of the radiator, a first water outlet pipeline of the radiator is connected with a water inlet pipeline of the working equipment, a second water outlet pipeline of the radiator is respectively connected with a water return pipeline of the demineralized water storage tank (1-1) and a water return pipeline of the antifreeze water storage tank (1-2), a demineralized water return valve (4-1) is arranged on the water return pipeline of the demineralized water storage tank (1-1), and an antifreeze water return valve (4-2) is arranged on the water return pipeline of the antifreeze water storage tank (1-2);
and valves are arranged on the pipelines.
2. The dual-working-medium indirect air-cooling system of claim 1, wherein the water outlet pipeline of the demineralized water storage tank (1-1) is connected to the downstream of the water inlet pipeline of the working equipment, and the water outlet pipeline of the antifreeze water storage tank (1-2) is connected to the upstream of the water inlet pipeline of the working equipment.
3. The dual mass indirect air cooling system of claim 1 or 2, further comprising a high level expansion tank (10) for maintaining water pressure;
the high-level expansion water tank (10) is arranged on a water inlet pipeline of the working equipment.
4. The dual-working-medium indirect air-cooling system of claim 3, further comprising a circulating water pump arranged on a water inlet pipeline or a water outlet pipeline of the working equipment, wherein the circulating water pump is used for compensating the head loss of the system.
5. The dual-working-medium indirect air-cooling system of claim 3, further comprising a liquid supplementing system (6) communicated with the antifreeze liquid storage tank (1-2).
6. The dual-working-medium indirect air-cooling system of claim 5, wherein the fluid replacement system (6) comprises an antifreeze fluid replacement tank and a pump, and the pump is arranged at an outlet of the antifreeze fluid replacement tank.
7. A dual mass indirect air cooling system according to claim 1, 2, 4, 5 or 6, wherein the working equipment is main plant auxiliary equipment (7-2).
8. The dual-working-medium indirect air-cooling system of claim 1, 2, 4, 5 or 6, wherein the working equipment is a main plant main unit condenser (7-1).
9. The control method of the dual-working-medium indirect air cooling system according to any one of claims 1 to 8, wherein the control method comprises the operations of liquid filling, liquid returning and system operation, and the switching of the two working mediums is completed through the liquid returning and the liquid filling, and the three operations are specifically as follows:
when liquid is filled, liquid in the demineralized water storage tank (1-1) or the antifreeze liquid storage tank (1-2) enters each pipeline and working equipment through the corresponding pump and the corresponding switching valve to finish liquid filling;
when the system operates, liquid exchanges heat in the working equipment, the liquid heated by the working equipment enters each radiator, the liquid is cooled in the radiators, the cooled liquid enters the working equipment again through outlets of the radiators, and the liquid in the system exchanges heat circularly between the working equipment and the radiators;
when returning liquid, the liquid in the system enters a demineralized water storage tank (1-1) or an antifreeze liquid storage tank (1-2) through a water return pipeline.
10. The control method according to claim 9, wherein the liquid charging operation and the liquid returning operation are specifically:
the liquid filling operation specifically comprises the following steps:
if the anti-freezing device is required to be anti-frozen, the switching valve is closed, the anti-freezing liquid conveying pump (2-2) is started, and anti-freezing liquid enters a water inlet pipeline of the working equipment and the working equipment to finish liquid filling;
otherwise, the switching valve is opened, the demineralized water delivery pump (2-1) is started, and the demineralized water enters the water inlet pipeline of the working equipment and the working equipment to finish liquid filling;
the liquid return operation specifically comprises the following steps:
when the system is filled with the antifreeze, the desalted water return valve (4-1) is closed, the antifreeze water return valve (4-2) is opened, and the liquid in the system enters the water return pipeline of the antifreeze water storage tank (1-2) through the second water outlet pipeline of the radiator and further enters the antifreeze water storage tank (1-2);
when the system is filled with desalted water, the antifreeze liquid return valve (4-2) is closed, the desalted water return valve (4-1) is opened, and liquid in the system enters the return pipeline of the desalted water storage tank (1-1) through the second water outlet pipeline of the radiator and further enters the desalted water storage tank (1-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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